Cylinder hone



Patented Dec. 29, 19'25.

PATENT OFFICE.

ERNEST P. CAMPBELL, OF STOCKTON, CALIFORNIA.

` CYLINDER HONE.

Application filed vMay 6,

To aZZ whom t may concern:

Beit known that I, ERNEST P. CAMPBELL, a citizen of the UnitedStates,residing at Stockton, county of Sanl Joaquin, State ofCalifornia, have invented certain new and useful Improvements inCylinder Hones; and I do declare the following tobe a full,

' clear, and exact description of the same,

reference bein-g had to the accompanying drawings, and to thecharactersof reference marked thereon, which form a part of thisapplication.

This invention relates to improvements 1n rotating bore-finishing tools,and particularly to a hone for finishing the cylinders of gas enginesand the like. c

The principal object of my invention 1s `to provide a device of thischaracter having a plurality of hones arranged to yieldably pressagainst the walls of the cylinder, and which are so-mounted that whilethe hones may be adjusted to finished cylinders ot' various differentsizes of bore, the pressure holding the hones against the Walls will-beconstant at all times.

.Another object of the invention is to mount the hones so that they willValways and automaticallyl accommodate themselves throughout theirlength to the surface against which they bear.

A further object is to arrange the'hone adjusting means so thatadjustments may be made after the hones are inserted in the cylinder andwithout removing them from said cylinder.

' V A further object of the invention is to produce a simple andinexpensive device and yet one which will be exceedingly effective forthe purposesv for which it is designed.

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings similar characters of reference indicate correspondingparts in lthe several views:

\ Fig. 1 is a side elevationfof my improved hone. l

Fig. 2 is an enlarged sectional view of the same.

Figs. 3 and 4 are end views of the device, showing the same equippedwith three and four hones respectively.v

Referring now more particularly to the characters of reference on thedrawings, the numeral 1 denotes a sleeve, forming the 1924. serial No.711,400.

shank of the tool, which is removably mounted to a standard taper orother shank 2 for connection to a boring or other machine, with aflexible coupling 3 interposed at a suitable point.V Y

' Slidably mounted in the sleeve 1 is a stem 4, having at its endnearest the shank 2 a cross pin 5 projecting through opposedlongitudinal slots 6 in the sleeve, the ends of the pin outwardly of thesleeve being fixed in al ring 7 surrounding the latter.

This ring is turnably mounted in a hand nut member 8 threaded on thesleeve, and is held against longitudinal movement relative to the nut bymeans of a lock nut 9 mounted on one end of the nut 8 and overlappingthe ring. A clamping bolt 10 is mounted in connection with the nut 8 forenabling the latter to be held on the sleeve at any position. By meansof this construction byturning 'the nut 8 one way or the other, the stemis moved lengthwise in the sleeve and without rotation, for the purposehereinafter shown.

In the opposite end of the stein is mounted a relatively. small screw orpin 11, between whose head l2 and a washer 13 slidable von. said pin isa. compression spring 14.

Projecting into the space between the washer 13 and the adjacent end ofthe stem `4 are the short arms 15 of arranged Vin Aevenly spacedrelation about the sleeve and pivoted on pins'17 fixed in lugs 18provided on theoutside of the sleeve. The bell cranks project toward theshank 2 with a diverging slant relative to the axis of the sleeve andhave pivoted on their outer ends rigid carriers 19, extending parallelto the sleeve, and countersunk on their outer faces to seat hones 20'ofsuitable character, which are cemented in place by any ordinary method.

Three or four bell cranks, and a correspending number of hones may beused, as shown in Figs. 3 and 4, ybut I prefer three, since with thisnumber there is no chance that one lhone will not contact with thecyliider, as might be the case if four were use f 1To prevent the outerends of the hones bell cranks 16,

loo

from possibly coming in contact with the Upon removing this knob, thescrew-head l2 is exposed, and the screw 11' may be adjusted to adjustthe tension of the spring 14 to the desired point.

In operation, it will be seen that by moving the stem 4 lengthwise inthe sleeve by manipulation of the nut 8, the short bell-l v crank arms15 will also be moved lengthwise of the sleeve, causing the angle ofsetting of the bellcranks to be altered, and consequently altering thedistance of the members 19 from the sleeve. At the same time, thetension of the spring 14 which controls the yielding or resilientmovement of the bellcranks and hones, remains undisturbed and henceconstant, since the spring,

vbeing mounted with the movable stem, moves therewith. The honecarriers, being pivotally connectedcentrally of their length to the bellcranks, will always accommodate themselves to the surface against whichthey bear.

By reason of the fact that the adjusting nut 8 is located at theopposite end of the sleeve from the hones, the latter may be adjustedafter they-are inserted into a cylinder.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fulfills the objects of theinvention as set forth herein.

washer on the pin, the ends of the arms adjacent the sleeve and beyondtheir pivots projecting from one end to the stem, a

jacent end of the stem anda spring on the` sleeve and beyond theirpivots projecting between the washer and the adjacent end of the stemand a spring on the pin between the washer and the outer end of the pin,the

pin being longitudinally adjustable in the stem whereby to alter thetension of the `spring irrespective of any movement of said -llVhilethis specication sets forth in de Itail the present and preferredconstruction of the device, still in practice such deviations` from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claims.

Having thus described my invention what i I claim as new and useful anddesire to secure by Letters Patent is:

l. A hone including a shank adapted to be rotated, arms projectingradially 'from the shank, hone carriers pivotally mounted on the outerends of the arms and extending lengthwise of the shank, spring meansacting to force the carriers away from the shank, means for positivelyaltering the distance of the carriers from the shank without alteringthe spring pressure, and independent means for altering the pressure ofthe spring means.

.2. A hone comprising a sleeve adapted to be rotated; arms pivotallymounted thereon in spaced radial relation and disposed at an angle tothe sleeve, hone carriers mounted on the outer ends of the arms, a stemlongitudinally adjustable in the sleeve, apin projecting from Aoney endto the stem, a

stem. v L

4. A honeJ comprising a sleeve, arms pivotally mounted thereon inradially spaced relation and disposed at an angle to the sleeve, honecarriers mounted on the outer ends of the arms, a longitudinallyadjustable stem in the sleeve, means provided with the stem at one end'thereof for engaging the inner ends of the arms whereby with a movementof the stem the angle of the arms relative to the sleeve will bealtered, a transverse pin -mounted in the stem adjacent the other endthereof and projecting through longitudinal slots in the sleeve, andmeanslon the sleeve applied to the pin for moving the same lengthwise inthe slots and enabling the pin tof'be held at any point in the length ofthe slots.

5. A hone comprising a sleeve, arms pivotally mounted thereon inradially spaced relation and disposed at an angle to thel sleeve, honecarriers mounted on the outer ends of .the arms, a longitudinallyadjustable stem .105

in the sleeve, means provided with the stem at one end thereof forengaging thel inner ends of the arms whereby with a movement of the stemthe angle of the arms relative to the sleeve will be altered, atransverse pin mounted in the stem' adjacent the other end thereof andprojecting through longitudinal slots 1n the sleeve, a ring surroundingthe sleeve and in which the ends of the pin are mounted, and coactingnuts on the -sleevebetween` which the rin is interposed."

In test1mony whereo I affix my signature.

ERNEST P. CAMPBELL.

